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CAUSE: Serial loopback (port SLPBK is driven high) of the specified gigabit transceiver block (GXB) receiver channel requires a VODCTRL setting of 800mV or higher (assuming 100 Ohms termination). Reverse-serial loopback requires a VODCTRL setting of 400mV (assuming 100 Ohms termination). Dynamic VODCTRL is required to allow this capability.
ACTION: Modify the design and specify VODCTRL as a port. If you use the MegaWizard Plug-In Manager to instantiate the ALTGXB megafunction, the port names are rx_slpbk, tx_srlpbk, and tx_vodctrl; however, because the ALTGXB MegaWizard Plug-In Manager is being deprecated, Altera recommends using ALTGX MegaWizard Plug-In Manager instead.
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